Adjustable Strap: The strap fits waist sizes from 33.5cm to 53cm with elasticity, making you relaxed.Suitable for Most Smartphones: This running belt for men and women can hold phones smaller than 7.0 inches, such as iPhone 12 Pro, iPhone XS, Max, XR, 8Plus, 7Plus, Samsung Galaxy S9+S8, Huawei, and Redmi.Quality Materials: Made of waterproof Lycra fabric with a waterproof PU inner film, cool and waterproof, comfortable and lightweight (only 100g/0.22 lbs ), protecting your belongings from sweat.Double Capacity : Inner folding + elastic fabric, the actual interior space is twice as big as the appearance, which can hold you smartphone, cash, credit cards, keys, etc.Headphone Hole and Reflective Strips: With a headphone hole, you can take exercise while listening to music freely. The highlighted reflective strips can warn others and make you safer when running at night.